In order to create content, such as building models or
terrain skins, that can be browsed within a digital earth, you
need have tools to help generate these. These tools might
include modeling packages to design 3D models, or utilities to
convert existing content into a more usable form.

As part of SRI's TerraVisionTM
system, we have released an open source C library and suite of tools to
help produce terrain datasets that can be navigated within that
browser. This library is referred to as the tsmApiTM, for Tile Set Manager Application Program
Interface. The source code and binary distributions for this library can
be found from: